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Especially in order to get the new lint for 'web-platform.test'
(https://github.com/w3c/web-platform-tests/pull/6868)

Chromium custom patch for lint.py is modified to accompany
upstream changes.

Bug: 749879
Change-Id: Ic2fb4655441f1d0e3bccbb7742565cb55645cf8f
Reviewed-on: https://chromium-review.googlesource.com/809745
Commit-Queue: Robert Ma <robertma@chromium.org>
Reviewed-by: Quinten Yearsley <qyearsley@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521913}